Control device for gear-shifting mechanism



Patented Aug. 28, 1923.

einen KEITH E. HANVILLE, 0F HEMPSTEAD, NEW YORK, ASSIGNOR TOA INTERNATIONAL TJIOTOR COMPANY, GF NEWT YORK, N. Y., A. CORFORATTON OF DEL' llL-l-EE.`

lCOLTTR.. DEVICE FOR GEAR-SHTFTING MECHANSM.

Application filed March '13, 1920. Serial No. 365,420.

To aZZ whomz'tmmy concern.' v

Be it known that LlSnrrH R. MANVILLE, a citizen of the United States, residing at Hempstead, Long Tsi-and, in the State of New York, have invented certain new and useful lmprovements in Control Devices for Gear-Shifting Mechanism, of which the following is .a specification, reference being had to the accompanying drawing, forming a part hereof.

lThis invention relates to a simple and inexpensive control mechanism for gear shifts designed primarily with reference to its use in connection with the shifting mechanism for motor cars having four speeds and reverse. ln such devices it is important that they shall satisfy manufacturing considerations of casting, machining-and as sembling and shall satisfy the operators requirements of facility of control. ln addition, such devices must Vserve to lock the shifter forks against simultaneous movement so as to prevent positively the accidental engagement of more than one set of gears at a time. The present improvements accom# plish all the objects discussed above. Beference is to be `h-ad torthe accompanying drawing for a detailed description of one embodiment, in which-V Figure 1 is a view in section of a fragment of the cover of a transmission case, showing theapplica-tion of the improved devices thereto.

Figure 2 is a view similar to Figure 1, but taken on a plane at right angles thereto.

Figure 3 is a detail view in plan of the locking device for the gears. i

The cover plate a of the transmission case may carry Y thereon, preferably integral therewith, a tower a for the support of the shifter lever b. This tower may have Icast within it adjacent the top a web a2 provided with acentral aperture through which extends the lever Z), -a spherical' enlargement ZJ of the lever resting on the web a2. A cover pla-te c for the tower a is bolted thereto and has a'. central opening therein which is of just suflicient size to receive the spherical enlargement b on the lever b. Within the tower a and its cover c are formed at dia-metrically opposed points,

registering grooves a3, 0'., respectively, to receive the ends of a pin Z which extends through the enlarged spherical portion ZJ of the lever Z). The protruding ends of the pin CZ constitute guide ears of irregular cross sectional form 'resting within the grooves a3, c to permit .rocking ofthe lever on its seat a2 in a transversevertical plane. The portion of the pin CZ within the spherical enlargement Z9 of the lever Z9 is cylindrical so that the lever Z9 can bemoved pivotally about the pin in a plane at right angles to the first mentioned plane of movement. Within the transmission case varermounted the usual shif'table gea-rs, yand associated shiiting mechanism, it being necessary for an understanding of the present inventionY to indicate conventionally inthe drawing only fragments of shifter :forks e, 76,9, one. of which forks, gmay be'considered, for instance, the fork controlling the movement of the reverse idler, vwhile the other two forks e, i may bevconsidered the forks to control selectively the engagement of the gears giving the four forward speeds. The lower end of the shifted lever Z) may obviously be moved into engagement with either one ofthe shifter forks e, f by rocking the lever transversely. lt is held against movement into engagement with the reverse fork g by means of a spring-pressed plunger lt carried with the lever and adapt ed to engage a flanged abutment 0:4, preferably cast within the tower a. The engagement of this plunger 71,k with the flanged abutment a4 limits the rocking movement of the lower end of the lever b so that it cannot be engaged with the reverse shifter fork g until the plunger is drawn out of the path of the abutment. Such withdrawal can be effected'conveniently Vby the operator, by means of a linger pull lever c adj acent the upper end of the shifter lever b, this fingerpull being connected operatively with the plunger l1, by means of a pull rod 7e extending downwardly alongside of the lever Z9.

The shifter forks e and f are held against accidental simultaneous operation by means of the locking device shownin Figure 3. This locking device comprises 'generally a yoke section Z in which rests the lower end of the shifter lever Z). lntegral with this yoke section are two oppositely extending supporting and guiding trunnions` Z', Z2 which rest in lugs m secured within the cover plate a; of the transmission housing by means of bolts m/ which may be formed integral with the lugs, and nutsmz, which' ico may be threaded on to the'ends of the bolts. Un vthe lower side of the yoke section Z and generally in line with the trunnions Z', ZZ are forin'ed locking flanges n, n Which rest Withinthe usual slots in the shifter forks e, y, g, according to the vlateral'pesition of the yoke Z with relation to said forks. For

instance, in the position shown in Figure l, the forks g are engaged by the 'locking flange n While the fork e isA engaged by the locking flange n. At this time the lever Z is not engagingeither of the forks. `When e lever is nioved laterally, thel lower end thereof Will slide the yoke section Z through `itsftrurinions Z', Z2 until the lower end of fthe lever engages onev or the other of the Yshifter forksY e, 7", g. Vlileanwvlnle the locking Vfia-nge for that particular fork Will have been carried out of the slot therein, While the locking flange for each other fork will remain in engagement Jherewith. K' Sxvinfing nioveinent of the lever in a transverse plane 'to its initial lateral Vinoveinent will then effect the shifting,` ofv he gears selected, tie

nicked u Without an unusual nio ent i by the operatorfof Ya character different fro-in any of his `Amovements during 'the changing of theforward speeds.l lThis is The i e, Y Y j 1,466,453

a desirable characteristic. in such a control' device. W

rl`he scope ofthe invention Will from the appended claims.

lclaiin as my invention:v

appear l. ln a gear casing in combination With gear shifting forks, of gear shifting mec-h anisin, control devices comprising,` av yoke nieniber, a shifting leverY engaging the yoke, alined trunnions carried by the yoke, lugs to support the trunnionsV for axial movenient thereof with the yoke, bolts carried ,vith the lugs and extending through the gear casing, nuts toA lock the bolts in place, and locking;` flanges for` the kforks carried With the'yoke yand movable therewith to lock one of VtheV shifter forks and' unlock Vanother shifter fork When the leverl isen- @aged operatively with the last named fork.

2. ln Combination with shifter fork of gear shifting mechanism for forward speeds and reverse, control devices Comprising a yoke nieinber, av shifter lever engaging the yoke, alined trunniens' carried by theyoke,y

inca-ns to support 'the trunnions for axial vinoveniei'it thereof VWith 4theyoke, locking for-the forks'earried vWith the yoke andrinovable therewith to lock Vone of the forks and unlock another fork vvhen'rtlie lever is engaged operatively with the'last named fork, an abutment carried with the gear casing, a plunger extending longitw dinally and exteriorally ofthe lever and'cooperzvtin@` with the flanged abutment to holfl 'the' lever against engagement with the reverse speed fork, and a `fingerv pull oper-V atively engaged'ivith the plunger to retract it from engagement With the abutment.

This specification*signedthis-llth day of `Y March, A. D.y 1920.

Karren. MANviLLn.' 

